Needs review
Source: Dragon Magazine #340

Description: Your knowledge of the supernatural allows you to exploit most attempts to manipulate magical energies.

Prerequisites: Knowledge (Arcana) (5 ranks), Spellcraft (5 ranks)

You may make an attack of opportunity against an opponent you threaten who dismisses a spell, directs or redirects an active spell, casts a quickened or swift spell, or attempts to turn or rebuke undead.

If your attack is successful, your opponent must make a Concentration check (DC 10 + damage dealt) or lose the action that provoked the attack of opportunity.